Ceiling insulation values have been increased from R-38 to R-49.Here’s a quick overview of the new requirements: Zones 7 & 8 encompass the very coldest parts of the country. North Idaho and much of the Intermountain West are in climate zone 6, which has only slightly lower insulation requirements than zones 7 & 8. The insulation requirements vary within 8 different climate zones. The biggest changes affect insulation values in ceilings, below grade walls, and to a lesser extent, above grade exterior walls. The new code requires a roughly 8-10% upgrade in building thermal efficiency from the previous code. The new code has stricter requirements for the energy efficiency of the building envelope (a technical term for the part of a building that keeps the interior warm, dry, and comfortable). S of January 1, 2011, many states, including Idaho, adopted new energy code requirements with the 2009 International Energy Conservation Code (IECC).
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